route filtering policies (from "split b" thread)

[Hostmaster, Verant]

Hello.  I'm very interested in learning what are the route filtering
policies of the larger ISPs.  We're architecting our /18 now, and concerned
that some of our smaller announcements (/22 or perhaps as small as /24)
might not get carried throughout the entire Internet.  What I would
appreciate is that anyone on this list who restricts their learned routes to
prefixes shorter than /24s please let me know what your policies are.

Is there a standard that most adhere to?  I am reading about "rirs" in
Randy's below email.. what were rirs' allocation policies?

We've recently discovered one large ISP blocking /23s and /24s from 24.*.*.*
, since it is a classic class "A".  After a few days of grief, they finally
realized that since 24.*.*.* had been chopped up and given to cablemodem
providers, it has announcements that small, and they now will accept as
small as /24s coming from 24.*.*.*.

Our block is 64.37.128.0/18, and I'm concerned that some old filters that
were put in place long ago might harm us, in that 64.*.*.* only recently
started being issued by ARIN, and that technically it is a class "A" block.

----
Dani D. Roisman
Verant Interactive
hostmaster at verant.com
(310) 840-8753

> -----Original Message-----
> From:	Randy Bush [SMTP:rbush at bainbridge.verio.net]
> Sent:	Monday, June 05, 2000 7:38 AM
> To:	Tanya Hinman
> Cc:	arin-discuss at arin.net
> Subject:	RE: split b
> 
> > This allocation was a transfer/merger issue. What policy are you
> referring
> > to?
> 
> hi tanya (and john),
> 
> a number of isps have route filters based on the rirs' allocation
> policies.
> 166.49.0.0 is in classic b space, where allocations are on a /16 boundary.
> our noc received a report of problems reaching the two /17s now being
> announced.  i am trying to determine if arin has changed its allocation
> policy in part of the classic b space, in which case we would change our
> filters.  i gather not.
> 
> randy